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POmultilevel caesar cipher
 

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  1. POmultilevel caesar cipher
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    <p>Hey, I'm trying to decode a multilevel Caesar cipher. By that I mean a string of letters could have been shifted several times, so if I say apply_shifts[(2,3),(4,5)], that means I shift everything from the 2nd letter by 3 followed by everything from the 4th letter by 5. Here's my code so far.</p> <pre><code>def find_best_shifts_rec(wordlist, text, start): """ Given a scrambled string and a starting position from which to decode, returns a shift key that will decode the text to words in wordlist, or None if there is no such key. Hint: You will find this function much easier to implement if you use recursion. wordlist: list of words text: scambled text to try to find the words for start: where to start looking at shifts returns: list of tuples. each tuple is (position in text, amount of shift) """ for shift in range(27): text=apply_shifts(text, [(start,-shift)]) #first word is text.split()[0] #test if first word is valid. if not, go to next shift if is_word(wordlist,text.split()[0])==False: continue #enter the while loop if word is valid, otherwise never enter and go to the next shift i=0 next_index=0 shifts={} while is_word(wordlist,text.split()[i])==True: next_index+= len(text.split()[i]) i=i+1 #once a word isn't valid, then try again, starting from the new index. if is_word(wordlist,text.split()[i])==False: shifts[next_index]=i find_best_shifts_rec(wordlist, text, next_index) return shifts </code></pre> <p>My problems are</p> <p>1) my code isn't running properly and I don't understand why it is messing up (it's not entering my while loop) and 2) I don't know how to test whether none of my "final shifts" (e.g. the last part of my string) are valid words and I also don't know how to go from there to the very beginning of my loop again.</p> <p>Help would be much appreciated.</p>
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    1. COHomework? You should also make sure your code is formatted correctly. It looks like it's not all indented.
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      1. USchmullig
    2. COYeah it's homework. I'm not asking someone to do it for me, just merely need help seeing what's wrong with my code.
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    3. COis the function "is_word" supplied to you? What does it look like?
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      1. USNate
 

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